ScriptingBridge with mail - how to add NSImage to content?

Question

I want to create method for "share to mail" ability. It should work like NSSharingService when you choose mail from the list. I have NSImage and I want to create empty mail message only with image in content. I have code:
    MailApplication *mail = [SBApplication
                             applicationWithBundleIdentifier:@"com.apple.Mail"];
    MailOutgoingMessage *emailMessage =
    [[[mail classForScriptingClass:@"outgoing message"] alloc]
     initWithProperties:
     [NSDictionary dictionaryWithObjectsAndKeys:
      @"this is my subject", @"subject",
      @"this is my content", @"content",
      nil]];
    [[mail outgoingMessages] addObject: emailMessage];
    emailMessage.visible = YES;
    NSString *attachmentFilePath = [NSString stringWithUTF8String:"<my provided file path>"];
    if ( [attachmentFilePath length] > 0 ) {
        MailAttachment *theAttachment = [[[mail
                                           classForScriptingClass:@"attachment"] alloc]
                                         initWithProperties:
                                         [NSDictionary dictionaryWithObjectsAndKeys:
                                          attachmentFilePath, @"fileName",
                                          nil]];
        [[emailMessage.content attachments] addObject: theAttachment];
    [emailMessage visible];
And earlier I have created NSImage (NSOpenGLView->glReadPixels->NSBitmapImageRep->NSImage). And now I want to add that NSImage as image in mail's message's content to get result like that:
What should I do?

Answer 1

I figured out. I had to write NSImage to temporary file, then add that file as attachment. Writing to temporary file is done like usually writing to file, just need to get temp directory. And it can be done like that:
          NSString *_temporary_directory = NSTemporaryDirectory();